The references should be at least 30% of them within the last 5 years. You need to peer review the literature review chapter and avoid that deal with the same ideas; cost, depression, complexity of regimen in several different places, say the same thing in more than one place and fill up references up to 47-50 references .
The last page should be from where did you cited these reference in this chapter ( for example: reference 1—page 5 article name…paragraph 3 and so on,,) so i can read from where did you cited specificly. The writing should be simple english, not high standard,similar to writing in literature review chapter and you can use in grammer ( however, therefore, thus, in addition, it is evident, because , it is also).
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